Currently Being ModeratedOct 4, 2012 12:20 AM (in response to kroes)
It does the same, when I set the mailer to Entourage, but I have an older Office version installed, that is not compatible with Aperture 3.4.1
What is your current Aperture version and Entourage version?
Any Pprogram you use from inside Aperture 3.4.1 must be a 64-bit version and sandboxed; your Entourage version may not be compatible any longer, see for example:
Check the Microsoft pages for upgrades.